Windows 10 Apps and Settings won't launch

Help!! About 2 weeks after downloading the free upgrade to Windows 10, all of the my apps and settings won't launch. PDF, Word, or Excel also will not open. I get an error that says 'element not found' when I try to open apps. I can't revert back to
Window 8.1 because I can't get to the settings. Is there a way to fix this or a way to uninstall 10 and re-install 8.1? Very frustrating since I just recently purchased Office. I sure hope I haven't lost it. :(

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I have a similar issue. None of the "Bing" apps (News, Money, Weather, etc) will launch or uninstall. I tried all of the above steps. No change. I also tried the GetApps string from the other forum in an admin powershell session. It just returned an
error saying those apps were running and couldn't continue.